package com.langyastudio.edu.security.component;

import cn.hutool.core.util.URLUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.PathMatcher;

import javax.annotation.PostConstruct;
import java.util.*;

/**
 * 动态权限数据源，用于获取动态权限规则
 */
public class DynamicSecurityMetadataSource implements FilterInvocationSecurityMetadataSource
{
    private static Map<String, ConfigAttribute> configAttributeMap = null;
    @Autowired
    private        DynamicSecurityService       dynamicSecurityService;

    @PostConstruct
    public void loadDataSource()
    {
        configAttributeMap = dynamicSecurityService.loadDataSource();
    }

    public void clearDataSource()
    {
        configAttributeMap.clear();
        configAttributeMap = null;
    }

    @Override
    public Collection<ConfigAttribute> getAttributes(Object o) throws IllegalArgumentException
    {
        if (configAttributeMap == null)
        {
            this.loadDataSource();
        }

        //获取当前访问的路径
        String           url         = ((FilterInvocation) o).getRequestUrl();
        String           path        = URLUtil.getPath(url);
        PathMatcher      pathMatcher = new AntPathMatcher();
        Iterator<String> iterator    = configAttributeMap.keySet().iterator();

        //获取访问该路径所需资源
        List<ConfigAttribute> configAttributes = new ArrayList<>();
        while (iterator.hasNext())
        {
            String pattern = iterator.next();
            if (pathMatcher.match(pattern, path))
            {
                configAttributes.add(configAttributeMap.get(pattern));
            }
        }

        // 未设置操作请求权限，返回空集合
        return configAttributes;
    }

    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes()
    {
        return null;
    }

    @Override
    public boolean supports(Class<?> aClass)
    {
        return true;
    }

}
